I created a new project with the image target tarmac_scaled.jpg and a 3D Object: sphere on the top of it.

I checked "Load Data Set NameOfMyProject" and "Activate" in my ARCamera and I chose this Data Set in my ImageTarget.

I put the 3D Object sphere under ImageTarget in my hierarchy.

And to finish i put the Vuforia App Licence Key in my ARCamera.

This configuration works.

However, the 3D Object is not at the center of my Image Target, but in the Camera Preview it is (I solved that but I don't really how... I changed 3D Object's position: X = 0.0005 Y = 0 Z = 0.0027 like in the sample instead of X = 0 Y = 0 Z = 0 and it works but when i changed again to (0,0,0) it works too...).

Finally I think the problem was the image target and the Vuforia App Licence Key because I chose mobile key instead of digital eyewear.

But I tried with Android and my webcam with my first project that's why I think the problem was the image target I chose. 

Am I right?

Ok, great to hear.

So, probably a good idea is to compare your setup with the one in the sample, to see if there are any notable differences;

See also some additional information here:

https://developer.vuforia.com/forum/faq/unity-player-settings

and:

https://developer.vuforia.com/forum/unity-3-extension-technical-discussion/vuforia-50-and-unity-5

Ok, so with these samples the AR works perfectly!

I just had to check "Activate" for the Tarmac.

I will test tonight with a new project again with the same image target but a different object and let you know if it works.

Thank you again.

Yes, correct.  ImageTargets-5-0-5.unitypackage is the one I'm referring to.

Thank you again for your reply.

I have only tried on my device (Sony Xperia M2) the Unity's samples games.

But there is not AR within so it's not enough to testing.

I looked Vuforia's samples and I saw this file: ImageTargets-5-0-5.unitypackage.

I created a new Unity project and I clicked on Scnes\Vuforia-ImageTarget.unity then a full hierarchy was created with in particular "ImageTargetChips"

Are you talking about these samples?  

I can't print these targets now, but I will tomorrow and let you know if these samples work on my device.

Have you verified that the samples do work on your device, i.e.:

• creating a new Unity project,
• importing the Vuforia image-targets-5-0-5.unitypackage,
• setting your License Key in the ARCamera
• build and run ?

Hi,

Thank you very much for your reply.

I tried with Unity 32 bits and the version 5.2.1p3 and I still have the same problem.

I also looked player settings and i saw no difference with your advice and my configuration.

With my android device it doesn't work too.

So i don't know why it doesn't work because it seems to be very simple but i can't resolve this issue since one month...

Have you another ideas to solve this issue please?

Do you need some pictures of my project's hierarchy to understand what i'm doing wrong?

Thanks , I used the lastest version of unity , and everything is ok

See also some additional information here:

https://developer.vuforia.com/forum/faq/unity-player-settings

and:

https://developer.vuforia.com/forum/unity-3-extension-technical-discussion/vuforia-50-and-unity-5

Vuforia 5.0 curently supports Unity 5.0.3 / 5.0.4 / 5.1.1 and higher;

for optimal performance however, it is recommended to use Unity 5.1.4 (for Unity 5.1.x)  or  5.2.1 (for Unity 5.2.x) or newer version.

See also:

https://developer.vuforia.com/library/articles/Solution/Vuforia-Supported-Versions

I use Mac Unity 5.0.0b1, and vuforia 5. When I ran the  image target example, I got the error:

MissingMethodException: Method not found: 'UnityEngine.Behaviour.get_isActiveAndEnabled'.Vuforia.VuforiaAbstractBehaviour.UpdateStatePrivate (Boolean forceUpdate, Boolean reapplyOldState)Vuforia.VuforiaAbstractBehaviour.Update ()